content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.flowable.internal.operators;
  
  import java.util.concurrent.atomic.AtomicLong;
  
  import org.reactivestreams.*;
  
  import hu.akarnokd.reactivestreams.extensions.RelaxedSubscriber;
  import io.reactivex.common.RxJavaCommonPlugins;
  import io.reactivex.common.exceptions.Exceptions;
  import io.reactivex.common.functions.Consumer;
  import io.reactivex.flowable.Flowable;
  import io.reactivex.flowable.internal.subscriptions.SubscriptionHelper;
  import io.reactivex.flowable.internal.utils.BackpressureHelper;
  
  public final class FlowableOnBackpressureDrop<T> extends AbstractFlowableWithUpstream<T, T> implements Consumer<T> {
  
      final Consumer<? super T> onDrop;
  
      public FlowableOnBackpressureDrop(Flowable<T> source) {
          super(source);
          this.onDrop = this;
      }
  
      public FlowableOnBackpressureDrop(Flowable<T> source, Consumer<? super T> onDrop) {
          super(source);
          this.onDrop = onDrop;
      }
  
      @Override
      public void accept(T t) {
          // deliberately ignoring
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super T> s) {
          this.source.subscribe(new BackpressureDropSubscriber<T>(s, onDrop));
      }
  
      static final class BackpressureDropSubscriber<T>
      extends AtomicLong implements RelaxedSubscriber<T>, Subscription {
  
          private static final long serialVersionUID = -6246093802440953054L;
  
          final Subscriber<? super T> actual;
          final Consumer<? super T> onDrop;
  
          Subscription s;
  
          boolean done;
  
          BackpressureDropSubscriber(Subscriber<? super T> actual, Consumer<? super T> onDrop) {
              this.actual = actual;
              this.onDrop = onDrop;
          }
  
          @Override
          public void onSubscribe(Subscription s) {
              if (SubscriptionHelper.validate(this.s, s)) {
                  this.s = s;
                  actual.onSubscribe(this);
                  s.request(Long.MAX_VALUE);
              }
          }
  
          @Override
          public void onNext(T t) {
              if (done) {
                  return;
              }
              long r = get();
              if (r != 0L) {
                  actual.onNext(t);
                  BackpressureHelper.produced(this, 1);
              } else {
                  try {
                      onDrop.accept(t);
                  } catch (Throwable e) {
                      Exceptions.throwIfFatal(e);
                      cancel();
                      onError(e);
                  }
              }
          }
  
          @Override
          public void onError(Throwable t) {
              if (done) {
                  RxJavaCommonPlugins.onError(t);
                  return;
              }
              done = true;
              actual.onError(t);
          }
  
          @Override
          public void onComplete() {
              if (done) {
                  return;
              }
              done = true;
              actual.onComplete();
          }
  
          @Override
          public void request(long n) {
              if (SubscriptionHelper.validate(n)) {
                  BackpressureHelper.add(this, n);
              }
          }
  
          @Override
          public void cancel() {
              s.cancel();
          }
      }
  }
  